On 11/06/2014 09:56 AM, Alexandre Courbot wrote:
On 10/30/2014 01:22 AM, Tomeu Vizoso wrote:From: Mikko Perttunen <mperttunen@xxxxxxxxxx> Implements functionality needed to change the rate of the memory bus clock. Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx> --- v2: * Use subsys_initcall(), so it gets probed after the MC driver and before the CAR driver --- drivers/memory/Kconfig | 10 + drivers/memory/Makefile | 1 - drivers/memory/tegra/Makefile | 1 + drivers/memory/tegra/tegra124-emc.c | 1133 +++++++++++++++++++++++++++++++++++ include/soc/tegra/memory.h | 2 + 5 files changed, 1146 insertions(+), 1 deletion(-) create mode 100644 drivers/memory/tegra/tegra124-emc.c diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig index 6d91c27..3ba3aef 100644 --- a/drivers/memory/Kconfig +++ b/drivers/memory/Kconfig @@ -51,6 +51,16 @@ config MVEBU_DEVBUS Armada 370 and Armada XP. This controller allows to handle flash devices such as NOR, NAND, SRAM, and FPGA. +config TEGRA124_EMC + bool "Tegra124 External Memory Controller driver" + default y + depends on ARCH_TEGRA_124_SOC + help + This driver is for the External Memory Controller (EMC) found on + Tegra124 chips. The EMC controls the external DRAM on the board. + This driver is required to change memory timings / clock rate for + external memory. + config TEGRA20_MC bool "Tegra20 Memory Controller(MC) driver" default y diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile index 1c932e7..8e5ec8d 100644 --- a/drivers/memory/Makefile +++ b/drivers/memory/Makefile @@ -12,5 +12,4 @@ obj-$(CONFIG_FSL_CORENET_CF) += fsl-corenet-cf.o obj-$(CONFIG_FSL_IFC) += fsl_ifc.o obj-$(CONFIG_MVEBU_DEVBUS) += mvebu-devbus.o obj-$(CONFIG_TEGRA20_MC) += tegra20-mc.o - obj-$(CONFIG_ARCH_TEGRA) += tegra/ diff --git a/drivers/memory/tegra/Makefile b/drivers/memory/tegra/Makefile index 51b9e8f..4e84bef 100644 --- a/drivers/memory/tegra/Makefile +++ b/drivers/memory/tegra/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += tegra30-mc.o obj-$(CONFIG_ARCH_TEGRA_114_SOC) += tegra114-mc.o obj-$(CONFIG_ARCH_TEGRA_124_SOC) += tegra124-mc.o obj-$(CONFIG_ARCH_TEGRA_132_SOC) += tegra124-mc.o +obj-$(CONFIG_TEGRA124_EMC) += tegra124-emc.o diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c new file mode 100644 index 0000000..8438de2 --- /dev/null +++ b/drivers/memory/tegra/tegra124-emc.c @@ -0,0 +1,1133 @@ +/* + * drivers/memory/tegra124-emc.c + * + * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved. + * + * Author: + * Mikko Perttunen <mperttunen@xxxxxxxxxx> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/clk-provider.h> +#include <linux/clk.h> +#include <linux/clkdev.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/sort.h> +#include <linux/string.h> + +#include <soc/tegra/fuse.h> +#include <soc/tegra/memory.h> + +#define EMC_FBIO_CFG5 0x104 +#define EMC_FBIO_CFG5_DRAM_TYPE_MASK 0x3 +#define EMC_FBIO_CFG5_DRAM_TYPE_SHIFT 0 + +#define EMC_INTSTATUS 0x0 +#define EMC_INTSTATUS_CLKCHANGE_COMPLETE BIT(4) + +#define EMC_CFG 0xc +#define EMC_CFG_DRAM_CLKSTOP_PD BIT(31) +#define EMC_CFG_DRAM_CLKSTOP_SR BIT(30) +#define EMC_CFG_DRAM_ACPD BIT(29) +#define EMC_CFG_DYN_SREF BIT(28) +#define EMC_CFG_PWR_MASK ((0xF << 28) | BIT(18)) +#define EMC_CFG_DSR_VTTGEN_DRV_EN BIT(18) + +#define EMC_REFCTRL 0x20 +#define EMC_REFCTRL_DEV_SEL_SHIFT 0 +#define EMC_REFCTRL_ENABLE BIT(31) + +#define EMC_TIMING_CONTROL 0x28 +#define EMC_RC 0x2c +#define EMC_RFC 0x30 +#define EMC_RAS 0x34 +#define EMC_RP 0x38 +#define EMC_R2W 0x3c +#define EMC_W2R 0x40 +#define EMC_R2P 0x44 +#define EMC_W2P 0x48 +#define EMC_RD_RCD 0x4c +#define EMC_WR_RCD 0x50 +#define EMC_RRD 0x54 +#define EMC_REXT 0x58 +#define EMC_WDV 0x5c +#define EMC_QUSE 0x60 +#define EMC_QRST 0x64 +#define EMC_QSAFE 0x68 +#define EMC_RDV 0x6c +#define EMC_REFRESH 0x70 +#define EMC_BURST_REFRESH_NUM 0x74 +#define EMC_PDEX2WR 0x78 +#define EMC_PDEX2RD 0x7c +#define EMC_PCHG2PDEN 0x80 +#define EMC_ACT2PDEN 0x84 +#define EMC_AR2PDEN 0x88 +#define EMC_RW2PDEN 0x8c +#define EMC_TXSR 0x90 +#define EMC_TCKE 0x94 +#define EMC_TFAW 0x98 +#define EMC_TRPAB 0x9c +#define EMC_TCLKSTABLE 0xa0 +#define EMC_TCLKSTOP 0xa4 +#define EMC_TREFBW 0xa8 +#define EMC_ODT_WRITE 0xb0 +#define EMC_ODT_READ 0xb4 +#define EMC_WEXT 0xb8 +#define EMC_CTT 0xbc +#define EMC_RFC_SLR 0xc0 +#define EMC_MRS_WAIT_CNT2 0xc4 + +#define EMC_MRS_WAIT_CNT 0xc8 +#define EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT 0 +#define EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK \ + (0x3FF << EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT) +#define EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT 16 +#define EMC_MRS_WAIT_CNT_LONG_WAIT_MASK \ + (0x3FF << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT) + +#define EMC_MRS 0xcc +#define EMC_MODE_SET_DLL_RESET BIT(8) +#define EMC_MODE_SET_LONG_CNT BIT(26) +#define EMC_EMRS 0xd0 +#define EMC_REF 0xd4 +#define EMC_PRE 0xd8 + +#define EMC_SELF_REF 0xe0 +#define EMC_SELF_REF_CMD_ENABLED BIT(0) +#define EMC_SELF_REF_DEV_SEL_SHIFT 30 + +#define EMC_MRW 0xe8 + +#define EMC_MRR 0xec +#define EMC_MRR_MA_SHIFT 16 +#define LPDDR2_MR4_TEMP_SHIFT 0 + +#define EMC_XM2DQSPADCTRL3 0xf8 +#define EMC_FBIO_SPARE 0x100 + +#define EMC_FBIO_CFG6 0x114 +#define EMC_EMRS2 0x12c +#define EMC_MRW2 0x134 +#define EMC_MRW4 0x13c +#define EMC_EINPUT 0x14c +#define EMC_EINPUT_DURATION 0x150 +#define EMC_PUTERM_EXTRA 0x154 +#define EMC_TCKESR 0x158 +#define EMC_TPD 0x15c + +#define EMC_AUTO_CAL_CONFIG 0x2a4 +#define EMC_AUTO_CAL_CONFIG_AUTO_CAL_START BIT(31) +#define EMC_AUTO_CAL_INTERVAL 0x2a8 +#define EMC_AUTO_CAL_STATUS 0x2ac +#define EMC_AUTO_CAL_STATUS_ACTIVE BIT(31) +#define EMC_STATUS 0x2b4 +#define EMC_STATUS_TIMING_UPDATE_STALLED BIT(23) + +#define EMC_CFG_2 0x2b8 +#define EMC_CFG_2_MODE_SHIFT 0 +#define EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR BIT(6) + +#define EMC_CFG_DIG_DLL 0x2bc +#define EMC_CFG_DIG_DLL_PERIOD 0x2c0 +#define EMC_RDV_MASK 0x2cc +#define EMC_WDV_MASK 0x2d0 +#define EMC_CTT_DURATION 0x2d8 +#define EMC_CTT_TERM_CTRL 0x2dc +#define EMC_ZCAL_INTERVAL 0x2e0 +#define EMC_ZCAL_WAIT_CNT 0x2e4 + +#define EMC_ZQ_CAL 0x2ec +#define EMC_ZQ_CAL_CMD BIT(0) +#define EMC_ZQ_CAL_LONG BIT(4) +#define EMC_ZQ_CAL_LONG_CMD_DEV0 \ + (DRAM_DEV_SEL_0 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD) +#define EMC_ZQ_CAL_LONG_CMD_DEV1 \ + (DRAM_DEV_SEL_1 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD) + +#define EMC_XM2CMDPADCTRL 0x2f0 +#define EMC_XM2DQSPADCTRL 0x2f8 +#define EMC_XM2DQSPADCTRL2 0x2fc +#define EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE BIT(0) +#define EMC_XM2DQSPADCTRL2_VREF_ENABLE BIT(5) +#define EMC_XM2DQPADCTRL 0x300 +#define EMC_XM2DQPADCTRL2 0x304 +#define EMC_XM2CLKPADCTRL 0x308 +#define EMC_XM2COMPPADCTRL 0x30c +#define EMC_XM2VTTGENPADCTRL 0x310 +#define EMC_XM2VTTGENPADCTRL2 0x314 +#define EMC_XM2VTTGENPADCTRL3 0x318 +#define EMC_XM2DQSPADCTRL4 0x320 +#define EMC_DLL_XFORM_DQS0 0x328 +#define EMC_DLL_XFORM_DQS1 0x32c +#define EMC_DLL_XFORM_DQS2 0x330 +#define EMC_DLL_XFORM_DQS3 0x334 +#define EMC_DLL_XFORM_DQS4 0x338 +#define EMC_DLL_XFORM_DQS5 0x33c +#define EMC_DLL_XFORM_DQS6 0x340 +#define EMC_DLL_XFORM_DQS7 0x344 +#define EMC_DLL_XFORM_QUSE0 0x348 +#define EMC_DLL_XFORM_QUSE1 0x34c +#define EMC_DLL_XFORM_QUSE2 0x350 +#define EMC_DLL_XFORM_QUSE3 0x354 +#define EMC_DLL_XFORM_QUSE4 0x358 +#define EMC_DLL_XFORM_QUSE5 0x35c +#define EMC_DLL_XFORM_QUSE6 0x360 +#define EMC_DLL_XFORM_QUSE7 0x364 +#define EMC_DLL_XFORM_DQ0 0x368 +#define EMC_DLL_XFORM_DQ1 0x36c +#define EMC_DLL_XFORM_DQ2 0x370 +#define EMC_DLL_XFORM_DQ3 0x374 +#define EMC_DLI_TRIM_TXDQS0 0x3a8 +#define EMC_DLI_TRIM_TXDQS1 0x3ac +#define EMC_DLI_TRIM_TXDQS2 0x3b0 +#define EMC_DLI_TRIM_TXDQS3 0x3b4 +#define EMC_DLI_TRIM_TXDQS4 0x3b8 +#define EMC_DLI_TRIM_TXDQS5 0x3bc +#define EMC_DLI_TRIM_TXDQS6 0x3c0 +#define EMC_DLI_TRIM_TXDQS7 0x3c4 +#define EMC_STALL_THEN_EXE_AFTER_CLKCHANGE 0x3cc +#define EMC_SEL_DPD_CTRL 0x3d8 +#define EMC_SEL_DPD_CTRL_DATA_SEL_DPD BIT(8) +#define EMC_SEL_DPD_CTRL_ODT_SEL_DPD BIT(5) +#define EMC_SEL_DPD_CTRL_RESET_SEL_DPD BIT(4) +#define EMC_SEL_DPD_CTRL_CA_SEL_DPD BIT(3) +#define EMC_SEL_DPD_CTRL_CLK_SEL_DPD BIT(2) +#define EMC_SEL_DPD_CTRL_DDR3_MASK \ + ((0xf << 2) | BIT(8)) +#define EMC_SEL_DPD_CTRL_MASK \ + ((0x3 << 2) | BIT(5) | BIT(8)) +#define EMC_PRE_REFRESH_REQ_CNT 0x3dc +#define EMC_DYN_SELF_REF_CONTROL 0x3e0 +#define EMC_TXSRDLL 0x3e4 +#define EMC_CCFIFO_ADDR 0x3e8 +#define EMC_CCFIFO_DATA 0x3ec +#define EMC_CCFIFO_STATUS 0x3f0 +#define EMC_CDB_CNTL_1 0x3f4 +#define EMC_CDB_CNTL_2 0x3f8 +#define EMC_XM2CLKPADCTRL2 0x3fc +#define EMC_AUTO_CAL_CONFIG2 0x458 +#define EMC_AUTO_CAL_CONFIG3 0x45c +#define EMC_IBDLY 0x468 +#define EMC_DLL_XFORM_ADDR0 0x46c +#define EMC_DLL_XFORM_ADDR1 0x470 +#define EMC_DLL_XFORM_ADDR2 0x474 +#define EMC_DSR_VTTGEN_DRV 0x47c +#define EMC_TXDSRVTTGEN 0x480 +#define EMC_XM2CMDPADCTRL4 0x484 +#define EMC_XM2CMDPADCTRL5 0x488 +#define EMC_DLL_XFORM_DQS8 0x4a0 +#define EMC_DLL_XFORM_DQS9 0x4a4 +#define EMC_DLL_XFORM_DQS10 0x4a8 +#define EMC_DLL_XFORM_DQS11 0x4ac +#define EMC_DLL_XFORM_DQS12 0x4b0 +#define EMC_DLL_XFORM_DQS13 0x4b4 +#define EMC_DLL_XFORM_DQS14 0x4b8 +#define EMC_DLL_XFORM_DQS15 0x4bc +#define EMC_DLL_XFORM_QUSE8 0x4c0 +#define EMC_DLL_XFORM_QUSE9 0x4c4 +#define EMC_DLL_XFORM_QUSE10 0x4c8 +#define EMC_DLL_XFORM_QUSE11 0x4cc +#define EMC_DLL_XFORM_QUSE12 0x4d0 +#define EMC_DLL_XFORM_QUSE13 0x4d4 +#define EMC_DLL_XFORM_QUSE14 0x4d8 +#define EMC_DLL_XFORM_QUSE15 0x4dc +#define EMC_DLL_XFORM_DQ4 0x4e0 +#define EMC_DLL_XFORM_DQ5 0x4e4 +#define EMC_DLL_XFORM_DQ6 0x4e8 +#define EMC_DLL_XFORM_DQ7 0x4ec +#define EMC_DLI_TRIM_TXDQS8 0x520 +#define EMC_DLI_TRIM_TXDQS9 0x524 +#define EMC_DLI_TRIM_TXDQS10 0x528 +#define EMC_DLI_TRIM_TXDQS11 0x52c +#define EMC_DLI_TRIM_TXDQS12 0x530 +#define EMC_DLI_TRIM_TXDQS13 0x534 +#define EMC_DLI_TRIM_TXDQS14 0x538 +#define EMC_DLI_TRIM_TXDQS15 0x53c +#define EMC_CDB_CNTL_3 0x540 +#define EMC_XM2DQSPADCTRL5 0x544 +#define EMC_XM2DQSPADCTRL6 0x548 +#define EMC_XM2DQPADCTRL3 0x54c +#define EMC_DLL_XFORM_ADDR3 0x550 +#define EMC_DLL_XFORM_ADDR4 0x554 +#define EMC_DLL_XFORM_ADDR5 0x558 +#define EMC_CFG_PIPE 0x560 +#define EMC_QPOP 0x564 +#define EMC_QUSE_WIDTH 0x568 +#define EMC_PUTERM_WIDTH 0x56c +#define EMC_BGBIAS_CTL0 0x570 +#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX BIT(3) +#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN BIT(2) +#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD BIT(1) +#define EMC_PUTERM_ADJ 0x574 + +#define DRAM_DEV_SEL_ALL 0 +#define DRAM_DEV_SEL_0 (2 << 30) +#define DRAM_DEV_SEL_1 (1 << 30) + +#define EMC_CFG_POWER_FEATURES_MASK \ + (EMC_CFG_DYN_SREF | EMC_CFG_DRAM_ACPD | EMC_CFG_DRAM_CLKSTOP_SR | \ + EMC_CFG_DRAM_CLKSTOP_PD | EMC_CFG_DSR_VTTGEN_DRV_EN) +#define EMC_REFCTRL_DEV_SEL(n) (((n > 1) ? 0 : 2) << EMC_REFCTRL_DEV_SEL_SHIFT) +#define EMC_DRAM_DEV_SEL(n) ((n > 1) ? DRAM_DEV_SEL_ALL : DRAM_DEV_SEL_0) + +#define EMC_STATUS_UPDATE_TIMEOUT 1000 + +enum emc_dram_type { + DRAM_TYPE_DDR3 = 0, + DRAM_TYPE_DDR1 = 1, + DRAM_TYPE_LPDDR3 = 2, + DRAM_TYPE_DDR2 = 3 +}; + +enum emc_dll_change { + DLL_CHANGE_NONE, + DLL_CHANGE_ON, + DLL_CHANGE_OFF +}; + +static int t124_emc_burst_regs[] = { + EMC_RC, + EMC_RFC, + EMC_RFC_SLR, + EMC_RAS, + EMC_RP, + EMC_R2W, + EMC_W2R, + EMC_R2P, + EMC_W2P, + EMC_RD_RCD, + EMC_WR_RCD, + EMC_RRD, + EMC_REXT, + EMC_WEXT, + EMC_WDV, + EMC_WDV_MASK, + EMC_QUSE, + EMC_QUSE_WIDTH, + EMC_IBDLY, + EMC_EINPUT, + EMC_EINPUT_DURATION, + EMC_PUTERM_EXTRA, + EMC_PUTERM_WIDTH, + EMC_PUTERM_ADJ, + EMC_CDB_CNTL_1, + EMC_CDB_CNTL_2, + EMC_CDB_CNTL_3, + EMC_QRST, + EMC_QSAFE, + EMC_RDV, + EMC_RDV_MASK, + EMC_REFRESH, + EMC_BURST_REFRESH_NUM, + EMC_PRE_REFRESH_REQ_CNT, + EMC_PDEX2WR, + EMC_PDEX2RD, + EMC_PCHG2PDEN, + EMC_ACT2PDEN, + EMC_AR2PDEN, + EMC_RW2PDEN, + EMC_TXSR, + EMC_TXSRDLL, + EMC_TCKE, + EMC_TCKESR, + EMC_TPD, + EMC_TFAW, + EMC_TRPAB, + EMC_TCLKSTABLE, + EMC_TCLKSTOP, + EMC_TREFBW, + EMC_FBIO_CFG6, + EMC_ODT_WRITE, + EMC_ODT_READ, + EMC_FBIO_CFG5, + EMC_CFG_DIG_DLL, + EMC_CFG_DIG_DLL_PERIOD, + EMC_DLL_XFORM_DQS0, + EMC_DLL_XFORM_DQS1, + EMC_DLL_XFORM_DQS2, + EMC_DLL_XFORM_DQS3, + EMC_DLL_XFORM_DQS4, + EMC_DLL_XFORM_DQS5, + EMC_DLL_XFORM_DQS6, + EMC_DLL_XFORM_DQS7, + EMC_DLL_XFORM_DQS8, + EMC_DLL_XFORM_DQS9, + EMC_DLL_XFORM_DQS10, + EMC_DLL_XFORM_DQS11, + EMC_DLL_XFORM_DQS12, + EMC_DLL_XFORM_DQS13, + EMC_DLL_XFORM_DQS14, + EMC_DLL_XFORM_DQS15, + EMC_DLL_XFORM_QUSE0, + EMC_DLL_XFORM_QUSE1, + EMC_DLL_XFORM_QUSE2, + EMC_DLL_XFORM_QUSE3, + EMC_DLL_XFORM_QUSE4, + EMC_DLL_XFORM_QUSE5, + EMC_DLL_XFORM_QUSE6, + EMC_DLL_XFORM_QUSE7, + EMC_DLL_XFORM_ADDR0, + EMC_DLL_XFORM_ADDR1, + EMC_DLL_XFORM_ADDR2, + EMC_DLL_XFORM_ADDR3, + EMC_DLL_XFORM_ADDR4, + EMC_DLL_XFORM_ADDR5, + EMC_DLL_XFORM_QUSE8, + EMC_DLL_XFORM_QUSE9, + EMC_DLL_XFORM_QUSE10, + EMC_DLL_XFORM_QUSE11, + EMC_DLL_XFORM_QUSE12, + EMC_DLL_XFORM_QUSE13, + EMC_DLL_XFORM_QUSE14, + EMC_DLL_XFORM_QUSE15, + EMC_DLI_TRIM_TXDQS0, + EMC_DLI_TRIM_TXDQS1, + EMC_DLI_TRIM_TXDQS2, + EMC_DLI_TRIM_TXDQS3, + EMC_DLI_TRIM_TXDQS4, + EMC_DLI_TRIM_TXDQS5, + EMC_DLI_TRIM_TXDQS6, + EMC_DLI_TRIM_TXDQS7, + EMC_DLI_TRIM_TXDQS8, + EMC_DLI_TRIM_TXDQS9, + EMC_DLI_TRIM_TXDQS10, + EMC_DLI_TRIM_TXDQS11, + EMC_DLI_TRIM_TXDQS12, + EMC_DLI_TRIM_TXDQS13, + EMC_DLI_TRIM_TXDQS14, + EMC_DLI_TRIM_TXDQS15, + EMC_DLL_XFORM_DQ0, + EMC_DLL_XFORM_DQ1, + EMC_DLL_XFORM_DQ2, + EMC_DLL_XFORM_DQ3, + EMC_DLL_XFORM_DQ4, + EMC_DLL_XFORM_DQ5, + EMC_DLL_XFORM_DQ6, + EMC_DLL_XFORM_DQ7, + EMC_XM2CMDPADCTRL, + EMC_XM2CMDPADCTRL4, + EMC_XM2CMDPADCTRL5, + EMC_XM2DQSPADCTRL2, + EMC_XM2DQPADCTRL2, + EMC_XM2DQPADCTRL3, + EMC_XM2CLKPADCTRL, + EMC_XM2CLKPADCTRL2, + EMC_XM2COMPPADCTRL, + EMC_XM2VTTGENPADCTRL, + EMC_XM2VTTGENPADCTRL2, + EMC_XM2VTTGENPADCTRL3, + EMC_XM2DQSPADCTRL3, + EMC_XM2DQSPADCTRL4, + EMC_XM2DQSPADCTRL5, + EMC_XM2DQSPADCTRL6, + EMC_DSR_VTTGEN_DRV, + EMC_TXDSRVTTGEN, + EMC_FBIO_SPARE, + EMC_ZCAL_INTERVAL, + EMC_ZCAL_WAIT_CNT, + EMC_MRS_WAIT_CNT, + EMC_MRS_WAIT_CNT2, + EMC_CTT, + EMC_CTT_DURATION, + EMC_CFG_PIPE, + EMC_DYN_SELF_REF_CONTROL, + EMC_QPOP +}; + +struct emc_timing { + unsigned long rate; + + /* Store EMC burst data in a union to minimize mistakes. This allows + * us to use the same burst data lists as used by the downstream and + * ChromeOS kernels. + */nit: Comment style.+ union { + u32 emc_burst_data[ARRAY_SIZE(t124_emc_burst_regs)]; + struct { + u32 __pad0[121]; + u32 emc_xm2dqspadctrl2; + u32 __pad1[15]; + u32 emc_zcal_interval; + u32 __pad2[1]; + u32 emc_mrs_wait_cnt; + }; + }; + + u32 emc_zcal_cnt_long; + u32 emc_auto_cal_interval; + u32 emc_ctt_term_ctrl; + u32 emc_cfg; + u32 emc_cfg_2; + u32 emc_sel_dpd_ctrl; + u32 __emc_cfg_dig_dll; + u32 emc_bgbias_ctl0; + u32 emc_auto_cal_config2; + u32 emc_auto_cal_config3; + u32 emc_auto_cal_config; + u32 emc_mode_reset; + u32 emc_mode_1; + u32 emc_mode_2; + u32 emc_mode_4; +}; + +struct tegra_emc { + struct platform_device *pdev; + + struct tegra_mc *mc; + + void __iomem *emc_regs; + + enum emc_dram_type dram_type; + u8 dram_num; + + struct emc_timing last_timing; + struct emc_timing *timings; + unsigned int num_timings; + + bool changing_timing;This field is just set to false once, and then never touched anywhere - is it needed at all?
It's not, looks like I missed it when splitting the driver into emc and clk parts. The clk part is using a similar variable.
+}; + +/* * * * * * * * * * * * * * * * * * * * * * * * * * + * Timing change sequence functions * + * * * * * * * * * * * * * * * * * * * * * * * * * */ + +static void emc_ccfifo_writel(struct tegra_emc *tegra, u32 val, + unsigned long offs) +{ + writel(val, tegra->emc_regs + EMC_CCFIFO_DATA); + writel(offs, tegra->emc_regs + EMC_CCFIFO_ADDR); +} + +static void emc_seq_update_timing(struct tegra_emc *tegra) +{ + int i; + + writel(1, tegra->emc_regs + EMC_TIMING_CONTROL); + + for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) { + if (!(readl(tegra->emc_regs + EMC_STATUS) & + EMC_STATUS_TIMING_UPDATE_STALLED)) + return; + } + + dev_err(&tegra->pdev->dev, "timing update failed\n"); +} + +static void emc_seq_disable_auto_cal(struct tegra_emc *tegra) +{ + int i; + + writel(0, tegra->emc_regs + EMC_AUTO_CAL_INTERVAL); + + for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) { + if (!(readl(tegra->emc_regs + EMC_AUTO_CAL_STATUS) & + EMC_AUTO_CAL_STATUS_ACTIVE)) + return; + } + + dev_err(&tegra->pdev->dev, "auto cal disable failed\n"); +} + +static void emc_seq_wait_clkchange(struct tegra_emc *tegra) +{ + int i; + + for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) { + if (readl(tegra->emc_regs + EMC_INTSTATUS) & + EMC_INTSTATUS_CLKCHANGE_COMPLETE) + return; + } + + dev_err(&tegra->pdev->dev, "clkchange failed\n"); +} + +static void emc_prepare_timing_change(struct tegra_emc *tegra, + const struct emc_timing *timing) +{ + u32 val, val2; + bool update = false; + int pre_wait = 0; + int i; + enum emc_dll_change dll_change; + + if ((tegra->last_timing.emc_mode_1 & 0x1) == (timing->emc_mode_1 & 1)) + dll_change = DLL_CHANGE_NONE; + else if (timing->emc_mode_1 & 1) + dll_change = DLL_CHANGE_ON; + else + dll_change = DLL_CHANGE_OFF; + + /* Clear CLKCHANGE_COMPLETE interrupts */ + + writel(EMC_INTSTATUS_CLKCHANGE_COMPLETE, + tegra->emc_regs + EMC_INTSTATUS); + + /* Disable dynamic self-refresh */ + + val = readl(tegra->emc_regs + EMC_CFG); + if (val & EMC_CFG_PWR_MASK) { + val &= ~EMC_CFG_POWER_FEATURES_MASK; + writel(val, tegra->emc_regs + EMC_CFG); + + pre_wait = 5; + } + + /* Disable SEL_DPD_CTRL for clock change */ + + val = readl(tegra->emc_regs + EMC_SEL_DPD_CTRL); + if (val & (tegra->dram_type == DRAM_TYPE_DDR3 ? + EMC_SEL_DPD_CTRL_DDR3_MASK : EMC_SEL_DPD_CTRL_MASK)) { + val &= ~(EMC_SEL_DPD_CTRL_DATA_SEL_DPD | + EMC_SEL_DPD_CTRL_ODT_SEL_DPD | + EMC_SEL_DPD_CTRL_CA_SEL_DPD | + EMC_SEL_DPD_CTRL_CLK_SEL_DPD); + if (tegra->dram_type == DRAM_TYPE_DDR3) + val &= ~EMC_SEL_DPD_CTRL_RESET_SEL_DPD; + writel(val, tegra->emc_regs + EMC_SEL_DPD_CTRL); + } + + /* Prepare DQ/DQS for clock change */ + + val = readl(tegra->emc_regs + EMC_BGBIAS_CTL0); + val2 = tegra->last_timing.emc_bgbias_ctl0; + if (!(timing->emc_bgbias_ctl0 & + EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX) && + (val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX)) { + val2 &= ~EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX; + update = true; + } + + if ((val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD) || + (val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN)) { + update = true; + } + + if (update) { + writel(val2, tegra->emc_regs + EMC_BGBIAS_CTL0); + if (pre_wait < 5) + pre_wait = 5; + } + + update = false; + val = readl(tegra->emc_regs + EMC_XM2DQSPADCTRL2); + if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_VREF_ENABLE && + !(val & EMC_XM2DQSPADCTRL2_VREF_ENABLE)) { + val |= EMC_XM2DQSPADCTRL2_VREF_ENABLE; + update = true; + } + + if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE && + !(val & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE)) { + val |= EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE; + update = true; + } + + if (update) { + writel(val, tegra->emc_regs + EMC_XM2DQSPADCTRL2); + if (pre_wait < 30) + pre_wait = 30; + } + + /* Wait to settle */ + + if (pre_wait) { + emc_seq_update_timing(tegra); + udelay(pre_wait); + } + + /* Program CTT_TERM control */ + + if (tegra->last_timing.emc_ctt_term_ctrl != timing->emc_ctt_term_ctrl) { + emc_seq_disable_auto_cal(tegra); + writel(timing->emc_ctt_term_ctrl, + tegra->emc_regs + EMC_CTT_TERM_CTRL); + emc_seq_update_timing(tegra); + } + + /* Program burst shadow registers */ + + for (i = 0; i < ARRAY_SIZE(timing->emc_burst_data); ++i) + __raw_writel(timing->emc_burst_data[i], + tegra->emc_regs + t124_emc_burst_regs[i]); + + tegra_mc_write_emem_configuration(tegra->mc, timing->rate); + + val = timing->emc_cfg & ~EMC_CFG_POWER_FEATURES_MASK; + emc_ccfifo_writel(tegra, val, EMC_CFG); + + /* Program AUTO_CAL_CONFIG */ + + if (timing->emc_auto_cal_config2 != + tegra->last_timing.emc_auto_cal_config2) + emc_ccfifo_writel(tegra, timing->emc_auto_cal_config2, + EMC_AUTO_CAL_CONFIG2); + if (timing->emc_auto_cal_config3 != + tegra->last_timing.emc_auto_cal_config3) + emc_ccfifo_writel(tegra, timing->emc_auto_cal_config3, + EMC_AUTO_CAL_CONFIG3); + if (timing->emc_auto_cal_config != + tegra->last_timing.emc_auto_cal_config) { + val = timing->emc_auto_cal_config; + val &= EMC_AUTO_CAL_CONFIG_AUTO_CAL_START; + emc_ccfifo_writel(tegra, val, EMC_AUTO_CAL_CONFIG); + } + + /* DDR3: predict MRS long wait count */ + + if (tegra->dram_type == DRAM_TYPE_DDR3 && dll_change == DLL_CHANGE_ON) { + u32 cnt = 32; + + if (timing->emc_zcal_interval != 0 && + tegra->last_timing.emc_zcal_interval == 0) + cnt -= tegra->dram_num * 256; + + val = timing->emc_mrs_wait_cnt + & EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK + >> EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT; + if (cnt < val) + cnt = val; + + val = timing->emc_mrs_wait_cnt + & ~EMC_MRS_WAIT_CNT_LONG_WAIT_MASK; + val |= (cnt << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT) + & EMC_MRS_WAIT_CNT_LONG_WAIT_MASK; + + writel(val, tegra->emc_regs + EMC_MRS_WAIT_CNT); + } + + val = timing->emc_cfg_2; + val &= ~EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR; + emc_ccfifo_writel(tegra, val, EMC_CFG_2); + + /* DDR3: Turn off DLL and enter self-refresh */ + + if (tegra->dram_type == DRAM_TYPE_DDR3 && dll_change == DLL_CHANGE_OFF) + emc_ccfifo_writel(tegra, timing->emc_mode_1, EMC_EMRS); + + /* Disable refresh controller */ + + emc_ccfifo_writel(tegra, EMC_REFCTRL_DEV_SEL(tegra->dram_num), + EMC_REFCTRL); + if (tegra->dram_type == DRAM_TYPE_DDR3) + emc_ccfifo_writel(tegra, + EMC_DRAM_DEV_SEL(tegra->dram_num) + | EMC_SELF_REF_CMD_ENABLED, + EMC_SELF_REF); + + /* Flow control marker */ + + emc_ccfifo_writel(tegra, 1, EMC_STALL_THEN_EXE_AFTER_CLKCHANGE); + + /* DDR3: Exit self-refresh */ + + if (tegra->dram_type == DRAM_TYPE_DDR3) + emc_ccfifo_writel(tegra, + EMC_DRAM_DEV_SEL(tegra->dram_num), + EMC_SELF_REF); + emc_ccfifo_writel(tegra, + EMC_REFCTRL_DEV_SEL(tegra->dram_num) + | EMC_REFCTRL_ENABLE, + EMC_REFCTRL); + + /* Set DRAM mode registers */ + + if (tegra->dram_type == DRAM_TYPE_DDR3) { + if (timing->emc_mode_1 != tegra->last_timing.emc_mode_1) + emc_ccfifo_writel(tegra, timing->emc_mode_1, EMC_EMRS); + if (timing->emc_mode_2 != tegra->last_timing.emc_mode_2) + emc_ccfifo_writel(tegra, timing->emc_mode_2, EMC_EMRS2); + + if ((timing->emc_mode_reset != + tegra->last_timing.emc_mode_reset) || + dll_change == DLL_CHANGE_ON) { + val = timing->emc_mode_reset; + if (dll_change == DLL_CHANGE_ON) { + val |= EMC_MODE_SET_DLL_RESET; + val |= EMC_MODE_SET_LONG_CNT; + } else { + val &= ~EMC_MODE_SET_DLL_RESET; + } + emc_ccfifo_writel(tegra, val, EMC_MRS); + } + } else { + if (timing->emc_mode_2 != tegra->last_timing.emc_mode_2) + emc_ccfifo_writel(tegra, timing->emc_mode_2, EMC_MRW2); + if (timing->emc_mode_1 != tegra->last_timing.emc_mode_1) + emc_ccfifo_writel(tegra, timing->emc_mode_1, EMC_MRW); + if (timing->emc_mode_4 != tegra->last_timing.emc_mode_4) + emc_ccfifo_writel(tegra, timing->emc_mode_4, EMC_MRW4); + } + + /* Issue ZCAL command if turning ZCAL on */ + + if (timing->emc_zcal_interval != 0 && + tegra->last_timing.emc_zcal_interval == 0) { + emc_ccfifo_writel(tegra, EMC_ZQ_CAL_LONG_CMD_DEV0, EMC_ZQ_CAL); + if (tegra->dram_num > 1) + emc_ccfifo_writel(tegra, EMC_ZQ_CAL_LONG_CMD_DEV1, + EMC_ZQ_CAL); + } + + /* Write to RO register to remove stall after change */ + + emc_ccfifo_writel(tegra, 0, EMC_CCFIFO_STATUS); + + if (timing->emc_cfg_2 & EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR) + emc_ccfifo_writel(tegra, timing->emc_cfg_2, EMC_CFG_2); + + /* Disable AUTO_CAL for clock change */ + + emc_seq_disable_auto_cal(tegra); + + /* Read register to wait until programming has settled */ + + readl(tegra->emc_regs + EMC_INTSTATUS); +} + +static void emc_complete_timing_change(struct tegra_emc *tegra, + const struct emc_timing *timing) +{ + u32 val; + + /* Wait until the state machine has settled */ + + emc_seq_wait_clkchange(tegra); + + /* Restore AUTO_CAL */ + + if (timing->emc_ctt_term_ctrl != tegra->last_timing.emc_ctt_term_ctrl) + writel(timing->emc_auto_cal_interval, + tegra->emc_regs + EMC_AUTO_CAL_INTERVAL); + + /* Restore dynamic self-refresh */ + + if (timing->emc_cfg & EMC_CFG_PWR_MASK) + writel(timing->emc_cfg, tegra->emc_regs + EMC_CFG); + + /* Set ZCAL wait count */ + + writel(timing->emc_zcal_cnt_long, tegra->emc_regs + EMC_ZCAL_WAIT_CNT); + + /* LPDDR3: Turn off BGBIAS if low frequency */ + + if (tegra->dram_type == DRAM_TYPE_LPDDR3 && + timing->emc_bgbias_ctl0 & + EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX) { + val = timing->emc_bgbias_ctl0; + val |= EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN; + val |= EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD; + writel(val, tegra->emc_regs + EMC_BGBIAS_CTL0); + } else { + if (tegra->dram_type == DRAM_TYPE_DDR3 && + readl(tegra->emc_regs + EMC_BGBIAS_CTL0) != + timing->emc_bgbias_ctl0) { + writel(timing->emc_bgbias_ctl0, + tegra->emc_regs + EMC_BGBIAS_CTL0); + } + + writel(timing->emc_auto_cal_interval, + tegra->emc_regs + EMC_AUTO_CAL_INTERVAL); + } + + /* Wait for timing to settle */ + + udelay(2); + + /* Reprogram SEL_DPD_CTRL */ + + writel(timing->emc_sel_dpd_ctrl, tegra->emc_regs + EMC_SEL_DPD_CTRL); + emc_seq_update_timing(tegra); + + tegra->last_timing = *timing; +} + +/* * * * * * * * * * * * * * * * * * * * * * * * * * + * Initialization and deinitialization * + * * * * * * * * * * * * * * * * * * * * * * * * * */ + +static void emc_read_current_timing(struct tegra_emc *tegra, + struct emc_timing *timing) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(t124_emc_burst_regs); ++i) + timing->emc_burst_data[i] = + readl(tegra->emc_regs + t124_emc_burst_regs[i]); + + timing->emc_cfg = readl(tegra->emc_regs + EMC_CFG); + + timing->emc_auto_cal_interval = 0; + timing->emc_zcal_cnt_long = 0; + timing->emc_mode_1 = 0; + timing->emc_mode_2 = 0; + timing->emc_mode_4 = 0; + timing->emc_mode_reset = 0; +} + +static int emc_init(struct tegra_emc *tegra) +{ + tegra->dram_type = readl(tegra->emc_regs + EMC_FBIO_CFG5); + tegra->dram_type &= EMC_FBIO_CFG5_DRAM_TYPE_MASK; + tegra->dram_type >>= EMC_FBIO_CFG5_DRAM_TYPE_SHIFT; + + tegra->dram_num = tegra_mc_get_emem_device_count(tegra->mc); + + emc_read_current_timing(tegra, &tegra->last_timing); + + tegra->changing_timing = false; + + return 0; +} + +static int load_one_timing_from_dt(struct tegra_emc *tegra, + struct emc_timing *timing, + struct device_node *node) +{ + int err; + u32 tmp; + + err = of_property_read_u32(node, "clock-frequency", &tmp); + if (err) { + dev_err(&tegra->pdev->dev, + "timing %s: failed to read rate\n", node->name); + return err; + } + + timing->rate = tmp; + + err = of_property_read_u32_array(node, "nvidia,emc-configuration", + timing->emc_burst_data, + ARRAY_SIZE(timing->emc_burst_data)); + if (err) { + dev_err(&tegra->pdev->dev, + "timing %s: failed to read emc burst data\n", + node->name); + return err; + } + +#define EMC_READ_PROP(prop, dtprop) { \ + err = of_property_read_u32(node, dtprop, &timing->prop); \ + if (err) { \ + dev_err(&tegra->pdev->dev, \ + "timing %s: failed to read " #prop "\n", \ + node->name); \ + return err; \ + } \ +}Let's make this static inline and let the compiler decide whether it is worth expanding it 14 times.+ + EMC_READ_PROP(emc_zcal_cnt_long, "nvidia,emc-zcal-cnt-long") + EMC_READ_PROP(emc_auto_cal_interval, "nvidia,emc-auto-cal-interval") + EMC_READ_PROP(emc_ctt_term_ctrl, "nvidia,emc-ctt-term-ctrl") + EMC_READ_PROP(emc_cfg, "nvidia,emc-cfg") + EMC_READ_PROP(emc_cfg_2, "nvidia,emc-cfg-2") + EMC_READ_PROP(emc_sel_dpd_ctrl, "nvidia,emc-sel-dpd-ctrl") + EMC_READ_PROP(emc_bgbias_ctl0, "nvidia,emc-bgbias-ctl0") + EMC_READ_PROP(emc_auto_cal_config2, "nvidia,emc-auto-cal-config2") + EMC_READ_PROP(emc_auto_cal_config3, "nvidia,emc-auto-cal-config3") + EMC_READ_PROP(emc_auto_cal_config, "nvidia,emc-auto-cal-config") + EMC_READ_PROP(emc_mode_reset, "nvidia,emc-mode-reset") + EMC_READ_PROP(emc_mode_1, "nvidia,emc-mode-1") + EMC_READ_PROP(emc_mode_2, "nvidia,emc-mode-2") + EMC_READ_PROP(emc_mode_4, "nvidia,emc-mode-4") + +#undef EMC_READ_PROP + + return 0; +} + +static int cmp_timings(const void *_a, const void *_b) +{ + const struct emc_timing *a = _a; + const struct emc_timing *b = _b; + + if (a->rate < b->rate) + return -1; + else if (a->rate == b->rate) + return 0; + else + return 1; +} + +static int load_timings_from_dt(struct tegra_emc *tegra, + struct device_node *node) +{ + struct device_node *child; + int child_count = of_get_child_count(node); + int i = 0, err; + + tegra->timings = devm_kzalloc(&tegra->pdev->dev, + sizeof(struct emc_timing) * child_count, + GFP_KERNEL); + if (!tegra->timings) + return -ENOMEM; + + tegra->num_timings = child_count; + + for_each_child_of_node(node, child) { + struct emc_timing *timing = tegra->timings + (i++); + + err = load_one_timing_from_dt(tegra, timing, child); + if (err) + return err; + } + + sort(tegra->timings, tegra->num_timings, sizeof(struct emc_timing), + cmp_timings, NULL); + + return 0; +} + +static const struct of_device_id tegra_emc_of_match[] = { + { .compatible = "nvidia,tegra124-emc" }, + {} +}; +MODULE_DEVICE_TABLE(of, tegra_emc_of_match); + +static struct tegra_emc *emc_instance; + +void tegra_emc_prepare_timing_change(unsigned long rate) +{ + int i; + + if (!emc_instance) + return; + + for (i = 0; i < emc_instance->num_timings; ++i) { + if (emc_instance->timings[i].rate == rate) + break; + } + + if (i == emc_instance->num_timings) + return;Same comment as previous patch - we should probably report this one way or the other.
True.
+ + emc_prepare_timing_change(emc_instance, emc_instance->timings + i); +} + +void tegra_emc_complete_timing_change(unsigned long rate) +{ + int i; + + if (!emc_instance) + return; + + for (i = 0; i < emc_instance->num_timings; ++i) { + if (emc_instance->timings[i].rate == rate) + break; + } + + if (i == emc_instance->num_timings) + return;Same here.+ + emc_complete_timing_change(emc_instance, emc_instance->timings + i); +} + +static int tegra_emc_probe(struct platform_device *pdev) +{ + struct tegra_emc *tegra; + struct device_node *node; + struct platform_device *mc_pdev; + struct resource *res; + u32 ram_code, node_ram_code; + int err; + + tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL); + if (!tegra) + return -ENOMEM; + + tegra->pdev = pdev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + tegra->emc_regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(tegra->emc_regs)) { + dev_err(&pdev->dev, "failed to map EMC regs\n"); + return PTR_ERR(tegra->emc_regs); + } + + node = of_parse_phandle(pdev->dev.of_node, + "nvidia,memory-controller", 0); + if (!node) { + dev_err(&pdev->dev, "could not get memory controller\n"); + return -ENOENT; + } + + mc_pdev = of_find_device_by_node(node); + if (!mc_pdev) + return -ENOENT;Isn't there a risk that we will return -ENOENT depending on the probe order? I.e. if this device is probed before the MC device?
Yes.. I remember having some trouble with this code. IIRC, I couldn't figure out a way to sanely detect if the MC driver had been probed or not. Clearly this is not good, though.
+ + tegra->mc = platform_get_drvdata(mc_pdev); + if (!tegra->mc) + return -ENOENT; + + of_node_put(node); + + ram_code = tegra_read_ram_code(); + + tegra->num_timings = 0; + + for_each_child_of_node(pdev->dev.of_node, node) { + if (strcmp(node->name, "timings")) + continue; + + err = of_property_read_u32(node, "nvidia,ram-code", + &node_ram_code); + if (err) { + dev_warn(&pdev->dev, + "skipping timing without ram-code\n"); + continue; + } + + if (node_ram_code != ram_code) + continue; + + err = load_timings_from_dt(tegra, node); + if (err) + return err; + break; + } + + if (tegra->num_timings == 0) + dev_warn(&pdev->dev, "no memory timings registered\n"); + + err = emc_init(tegra); + if (err) { + dev_err(&pdev->dev, "initialization failed: %d\n", err); + return err; + } + + platform_set_drvdata(pdev, tegra); + + emc_instance = tegra; + + return 0; +}; + +static struct platform_driver tegra_emc_driver = { + .probe = tegra_emc_probe, + .driver = { + .name = "tegra-emc", + .of_match_table = tegra_emc_of_match, + }, +}; + +static int tegra_emc_init(void) +{ + return platform_driver_register(&tegra_emc_driver); +} +subsys_initcall(tegra_emc_init); + +MODULE_AUTHOR("Mikko Perttunen <mperttunen@xxxxxxxxxx>"); +MODULE_DESCRIPTION("Tegra124 EMC memory driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/soc/tegra/memory.h b/include/soc/tegra/memory.h index f307516..0e0a2e9 100644 --- a/include/soc/tegra/memory.h +++ b/include/soc/tegra/memory.h @@ -13,5 +13,7 @@ struct tegra_mc; void tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate); int tegra_mc_get_emem_device_count(struct tegra_mc *mc); +void tegra_emc_prepare_timing_change(unsigned long rate); +void tegra_emc_complete_timing_change(unsigned long rate); #endif /* __SOC_TEGRA_MEMORY_H__ */
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